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データを開く
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基本情報
登録情報 | データベース: SASBDB / ID: SASDAC9 |
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![]() | Varkud Satellite (VS) ribozyme in Tris
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生物種 | ![]() ![]() |
![]() | ![]() タイトル: Crystal structure of the Varkud satellite ribozyme. 著者: Nikolai B Suslov / Saurja DasGupta / Hao Huang / James R Fuller / David M J Lilley / Phoebe A Rice / Joseph A Piccirilli / ![]() ![]() 要旨: The Varkud satellite (VS) ribozyme mediates rolling-circle replication of a plasmid found in the Neurospora mitochondrion. We report crystal structures of this ribozyme from Neurospora intermedia at ...The Varkud satellite (VS) ribozyme mediates rolling-circle replication of a plasmid found in the Neurospora mitochondrion. We report crystal structures of this ribozyme from Neurospora intermedia at 3.1 Å resolution, which revealed an intertwined dimer formed by an exchange of substrate helices. In each protomer, an arrangement of three-way helical junctions organizes seven helices into a global fold that creates a docking site for the substrate helix of the other protomer, resulting in the formation of two active sites in trans. This mode of RNA-RNA association resembles the process of domain swapping in proteins and has implications for RNA regulation and evolution. Within each active site, adenine and guanine nucleobases abut the scissile phosphate, poised to serve direct roles in catalysis. Similarities to the active sites of the hairpin and hammerhead ribozymes highlight the functional importance of active-site features, underscore the ability of RNA to access functional architectures from distant regions of sequence space, and suggest convergent evolution. |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
-モデル
モデル #358 | ![]() タイプ: dummy / ソフトウェア: DAMMIN / ダミー原子の半径: 4.00 A ![]() |
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モデル #359 | ![]() タイプ: mix / ソフトウェア: FoXS / ダミー原子の半径: 1.90 A / カイ2乗値: 680.308162367 ![]() |
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試料
![]() | 名称: Varkud Satellite (VS) ribozyme in Tris / 試料濃度: 1.50-4.50 |
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バッファ | 名称: Tris![]() 濃度: 10.00 mM / pH: 7.5 / 組成: 25 mM KCl and 5 mM MgCl2 |
要素 #217 | 名称: G638A / タイプ: RNA / 記述: Varkud Satellite (VS) ribozyme / 分子量: 60.15 / 分子数: 2 / 由来: Neurospora 配列: GGCGCUGUGU CGCAAUCUGC GAAGGGCGUC GUCGGCCCAA GCGGUAGUAA GCAGGGAACU CACCUCCAAU GAAACACAUU GUCGUAGCAG UUGACUACUG UUAUGUGAUU GGUAGAGGCU AAGUGACGGU AUUGGCGUAA GCCAAUACCG CAGCACAGCA CAAGCCCGCU UGCGAGAUUA CAGCGC |
-実験情報
ビーム | 設備名称: Advanced Light Source (ALS) 12.3.1 (SIBYLS) / 地域: Berkeley, CA / 国: USA ![]() ![]() | |||||||||||||||||||||
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検出器 | 名称: Pilatus 2M | |||||||||||||||||||||
スキャン | 測定日: 2012年3月6日 / フレーム数: 24 / 単位: 1/nm /
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距離分布関数 P(R) |
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結果 | コメント: SAXS data from a catalytically inactive construct support the overall conformation and dimeric state of the VS ribozyme in its x-ray crystal structure.
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